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<?php
namespace Bitrix\Main\Data;
use Bitrix\Main\Application;
use Bitrix\Main\Config;
use Bitrix\Main\Data\LocalStorage;
class CacheEngineMemcache implements ICacheEngine, ICacheEngineStat, LocalStorage\Storage\CacheEngineInterface
{
public const SESSION_MEMCACHE_CONNECTION = 'cache.memcache';
protected static $memcache = null;
private static $isConnected = false;
private static $baseDirVersion = array();
protected $sid = "BX";
//cache stats
private $written = false;
private $read = false;
// unfortunately is not available for memcache...
protected $useLock = false;
protected $ttlMultiplier = 2;
protected static $locks = array();
protected $old = false;
/**
* Engine constructor.
* @param array $options Cache options.
*/
function __construct($options = [])
{
$config = Config\Configuration::getValue("cache");
if (self::$memcache == null)
{
self::$memcache = new \Memcache;
$v = (isset($config["memcache"]))? $config["memcache"]: null;
if ($v != null && isset($v["host"]) && $v["host"] != "")
{
if ($v != null && isset($v["port"]))
{
$port = intval($v["port"]);
}
else
{
$port = 11211;
}
$connectionPool = Application::getInstance()->getConnectionPool();
$connectionPool->setConnectionParameters(self::SESSION_MEMCACHE_CONNECTION, [
'className' => MemcacheConnection::class,
'host' => $v['host'],
'port' => $port,
]);
/** @var MemcacheConnection $memcacheConnection */
$memcacheConnection = $connectionPool->getConnection(self::SESSION_MEMCACHE_CONNECTION);
self::$memcache = $memcacheConnection->getResource();
self::$isConnected = $memcacheConnection->isConnected();
}
}
if ($config && is_array($config))
{
if (isset($config["use_lock"]))
{
$this->useLock = !((bool)$config["use_lock"]);
}
if (isset($config["sid"]) && ($config["sid"] != ""))
{
$this->sid = $config["sid"];
}
if (isset($config["ttl_multiplier"]) && $this->useLock)
{
$this->ttlMultiplier = (integer)$config["ttl_multiplier"];
}
}
if (!empty($options) && isset($options['actual_data']))
{
$this->useLock = !((bool)$options['actual_data']);
}
if ($this->useLock)
{
$this->sid .= 2;
}
else
{
$this->sid .= 3;
$this->ttlMultiplier = 1;
}
}
/**
* Closes opened connection.
*
* @return void
*/
function close()
{
if (self::$memcache != null)
{
self::$memcache->close();
self::$memcache = null;
}
}
/**
* Returns number of bytes read from memcache or false if there was no read operation.
* Stub function always returns false.
*
* @return integer|false
*/
public function getReadBytes()
{
return $this->read;
}
/**
* Returns number of bytes written to memcache or false if there was no write operation.
* Stub function always returns false.
*
* @return integer|false
*/
public function getWrittenBytes()
{
return $this->written;
}
/**
* Returns physical file path after read or write operation.
* Stub function always returns '' (empty string).
*
* @return string
*/
public function getCachePath()
{
return "";
}
/**
* Returns true if cache can be read or written.
*
* @return bool
*/
function isAvailable()
{
return self::$isConnected;
}
/**
* Tries to put non blocking exclusive lock on the cache entry.
* Returns true on success.
*
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $key Calculated cache key.
* @param integer $TTL Expiration period in seconds.
*
* @return boolean
*/
protected function lock($baseDir, $initDir, $key, $TTL)
{
if (
isset(self::$locks[$baseDir])
&& isset(self::$locks[$baseDir][$initDir])
&& isset(self::$locks[$baseDir][$initDir][$key])
)
{
return true;
}
elseif (self::$memcache->add($key, 1, 0, intval($TTL)))
{
self::$locks[$baseDir][$initDir][$key] = true;
return true;
}
elseif (!self::$memcache->get($key))
{
self::$locks[$baseDir][$initDir][$key] = true;
self::$memcache->replace($key, 1, 0, $TTL);
return true;
}
return false;
}
/**
* Releases the lock obtained by lock method.
*
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $key Calculated cache key.
* @param integer $TTL Expiration period in seconds.
*
* @return void
*/
protected function unlock($baseDir, $initDir = false, $key = false, $TTL = 0)
{
if ($key !== false)
{
if ($TTL > 0)
{
self::$memcache->set($key, 1, 0, time() + intval($TTL));
}
else
{
self::$memcache->replace($key, "", 0, 1);
}
unset(self::$locks[$baseDir][$initDir][$key]);
}
elseif ($initDir !== false)
{
if (isset(self::$locks[$baseDir][$initDir]))
{
foreach (self::$locks[$baseDir][$initDir] as $subKey)
{
$this->unlock($baseDir, $initDir, $subKey, $TTL);
}
unset(self::$locks[$baseDir][$initDir]);
}
}
elseif ($baseDir !== false)
{
if (isset(self::$locks[$baseDir]))
{
foreach (self::$locks[$baseDir] as $subInitDir)
{
$this->unlock($baseDir, $subInitDir, false, $TTL);
}
}
}
}
/**
* Cleans (removes) cache directory or file.
*
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $filename File name.
*
* @return void
*/
function clean($baseDir, $initDir = false, $filename = false)
{
$key = false;
if (is_object(self::$memcache))
{
if($filename <> '')
{
$this->getBaseDirVersion($baseDir, true);
if(self::$baseDirVersion[$baseDir] === false || self::$baseDirVersion[$baseDir] === '')
{
return;
}
$initDirVersion = $this->getInitDirVersion($baseDir, $initDir, true);
$key = self::$baseDirVersion[$baseDir]."|".$initDirVersion."|".$filename;
$cachedData = self::$memcache->get($key);
if(is_array($cachedData))
{
self::$memcache->set($key.'|old', $cachedData, 0, 1);
}
self::$memcache->replace($key, "", 0, 1);
}
else
{
if($initDir <> '')
{
$this->getBaseDirVersion($baseDir, true);
if(self::$baseDirVersion[$baseDir] === false || self::$baseDirVersion[$baseDir] === '')
{
return;
}
$initDirKey = self::$baseDirVersion[$baseDir]."|".$initDir;
$initDirVersion = self::$memcache->get($initDirKey);
if($initDirVersion === false || $initDirVersion === '')
{
self::$memcache->set($initDirKey.'|old', $initDirVersion, 0, 1);
}
self::$memcache->replace($initDirKey, "", 0, 1);
}
else
{
$this->getBaseDirVersion($baseDir, true);
if(isset(self::$baseDirVersion[$baseDir]))
{
self::$memcache->set($this->sid.$baseDir.'|old', self::$baseDirVersion[$baseDir], 0, 1);
unset(self::$baseDirVersion[$baseDir]);
}
self::$memcache->replace($this->sid.$baseDir, "", 0, 1);
}
}
}
$this->unlock($baseDir, $initDir, $key."~");
}
/**
* Reads cache from the memcache. Returns true if key value exists, not expired, and successfully read.
*
* @param mixed &$allVars Cached result.
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $filename File name.
* @param integer $TTL Expiration period in seconds.
*
* @return boolean
*/
function read(&$allVars, $baseDir, $initDir, $filename, $TTL)
{
$this->getBaseDirVersion($baseDir);
if (self::$baseDirVersion[$baseDir] === false || self::$baseDirVersion[$baseDir] === '')
{
return false;
}
$initDirVersion = $this->getInitDirVersion($baseDir, $initDir);
$key = self::$baseDirVersion[$baseDir]."|".$initDirVersion."|".$filename;
if ($this->useLock)
{
$cachedData = self::$memcache->get($key);
if (!is_array($cachedData))
{
$cachedData = self::$memcache->get($key.'|old');
if (is_array($cachedData))
{
$this->old = true;
}
}
if (!is_array($cachedData))
{
return false;
}
if ($this->lock($baseDir, $initDir, $key."~", $TTL))
{
if ($this->old || $cachedData["datecreate"] < (time() - $TTL))
{
return false;
}
}
$allVars = $cachedData["content"];
}
else
{
$allVars = self::$memcache->get($key);
}
if ($allVars === false || $allVars === '')
{
return false;
}
return true;
}
/**
* Puts cache into the memcache.
*
* @param mixed $allVars Cached result.
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $filename File name.
* @param integer $TTL Expiration period in seconds.
*
* @return void
*/
function write($allVars, $baseDir, $initDir, $filename, $TTL)
{
if (!isset(self::$baseDirVersion[$baseDir]))
self::$baseDirVersion[$baseDir] = self::$memcache->get($this->sid.$baseDir);
if (self::$baseDirVersion[$baseDir] === false || self::$baseDirVersion[$baseDir] === '')
{
self::$baseDirVersion[$baseDir] = $this->sid.md5(mt_rand());
self::$memcache->set($this->sid.$baseDir, self::$baseDirVersion[$baseDir]);
}
if ($initDir !== false)
{
$initDirVersion = self::$memcache->get(self::$baseDirVersion[$baseDir]."|".$initDir);
if ($initDirVersion === false || $initDirVersion === '')
{
$initDirVersion = $this->sid.md5(mt_rand());
self::$memcache->set(self::$baseDirVersion[$baseDir]."|".$initDir, $initDirVersion);
}
}
else
{
$initDirVersion = "";
}
$key = self::$baseDirVersion[$baseDir]."|".$initDirVersion."|".$filename;
$time = time();
$exp = $this->ttlMultiplier > 0? $time + intval($TTL) * $this->ttlMultiplier: 0;
if ($this->useLock)
{
self::$memcache->set($key, array("datecreate" => $time, "content" => $allVars), 0, $exp);
self::$memcache->delete($key.'|old');
$this->unlock($baseDir, $initDir, $key."~", $TTL);
}
else
{
self::$memcache->set($key, $allVars, 0, $exp);
}
}
/**
* Returns true if cache has been expired.
* Stub function always returns true.
*
* @param string $path Absolute physical path.
*
* @return boolean
*/
function isCacheExpired($path)
{
return false;
}
/**
* Return InitDirVersion
* @param bool|string $baseDir Base cache directory (usually /bitrix/cache).
* @param bool|string $initDir Directory within base.
* @param bool $skipOld Return cleaned value.
* @return array|bool|string
*/
function getInitDirVersion($baseDir, $initDir = false, $skipOld = false)
{
if ($initDir !== false)
{
$old = false;
$initDirKey = self::$baseDirVersion[$baseDir]."|".$initDir;
$initDirVersion = self::$memcache->get($initDirKey);
if (($initDirVersion === false || $initDirVersion === '') && !$skipOld)
{
$initDirVersion = self::$memcache->get($initDirKey.'|old');
$old = true;
}
if ($initDirVersion === false || $initDirVersion === '')
{
return false;
}
if ($old)
{
$this->old = true;
}
return $initDirVersion;
}
else
{
return '';
}
}
/**
* Return BaseDirVersion
* @param bool|string $baseDir Base cache directory (usually /bitrix/cache).
* @param bool $skipOld Return cleaned value.
*
* @return void
*/
function getBaseDirVersion($baseDir, $skipOld = false)
{
$baseDirKey = $this->sid.$baseDir;
if (!isset(self::$baseDirVersion[$baseDir]))
{
self::$baseDirVersion[$baseDir] = self::$memcache->get($baseDirKey);
}
if ((self::$baseDirVersion[$baseDir] === false || self::$baseDirVersion[$baseDir] === '') && !$skipOld)
{
self::$baseDirVersion[$baseDir] = self::$memcache->get($baseDirKey.'|old');
if (isset(self::$baseDirVersion[$baseDir]))
{
$this->old = true;
}
}
}
}